Upper respiratory tract infections are referred to as epiglottitis, also known as the common cold, and include a general term for acute inflammation of the nasal passages, pharynx, or larynx. Broadly speaking, epiglottitis is not a disease diagnosis, but a group of diseases, including the common cold, viral pharyngitis, laryngitis, herpes pharyngitis, pharyngoconjunctival fever, and bacterial pharyngo-tonsillitis. Narrowly defined, uptake, also known as the common cold, is the most common acute respiratory infectious disease and is mostly self-limiting. Colds can cause the body to show signs of floating pulse that need to be carefully examined. The auxiliary examination methods of floating pulse caused by colds: 1, blood test: the total number of white blood cells decreases, the relative increase of lymphocytes, and the disappearance of eosinophilic granulocytes. When combined with bacterial infection, the total number of white blood cells and neutrophils increase. 2, immunofluorescence or immunoenzymatic staining method to detect antigen take the patient nasal wash mucosal epithelial cells in the smear specimen, with fluorescence or enzyme-labeled influenza virus immune serum staining to detect the antigen, out of the results of the fast, high sensitivity, and help early diagnosis. Such as the application of monoclonal antibodies to detect anti-principle can identify influenza A, B and C. 3, polymerase chain reaction (pcr) determination of influenza virus rna it can be directly from the patient’s secretion to detect the virus rna, is a direct, rapid, sensitive method. It is a direct, rapid and sensitive method. Currently, the application of pcr-enzyme beam (pcr-eia) is improved to directly detect influenza virus rna, which is much more sensitive than viral culture, and is rapid and direct. 4.Virus isolation inoculate the gargle-containing fluid of acute-phase patients into chicken embryo amniotic sac or urinary bladder fluid for virus isolation. 5.Serological examination application of hemagglutination resistance test. Complement binding test etc. Determine the antibody in the serum in the acute and recovery period, if there is more than 4-fold increase, it will be positive. Application of neutralization immunoenzyme test to determine the neutralization titer, can detect neutralizing antibodies, these are helpful for retrospective diagnosis and epidemiological investigation.